Wrench.



(No Model.)

WITJYESSES P. GRELSON.

WRENCH.

Applicatioh led Jan. 19, 1901.)

Patented Apr. I6, |90l.

NITED STATEs PATENT Finca.

PETER GRELSON, OF WORTHINGTON, MINNESOTA.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 672,037, dated April 16, 1901.

Appncatioi. med January 19, 1901. serai No. 43,841. (No model.)

lo all whom, t may concern.

ABe it known that I, PETER GRELsoN, a citizen of the United States, residing at Worthington, in the county of Nobles and State of Minnesota, have invented certain new and useful Improvements in Wrenches; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in monkey-wrenches of the class havinga wormscrew adapted to be raised sidewise out of engagement with the thread or teeth of the wrench-bar when the jaws are to be spread or closed quickly; and the object of the invention is to provide a cheap, simple, and still durable and effective wrench of said class. To attain this object, my wrench consists of the parts and arrangement illustrated in the accompanying drawings, in which- Figure 1 is a side view of my complete wrench. Fig. 2 is a vertical section,on the line o, c, in Fig. l, of the movable jaw only. Fig. 3 is a diametrical longitudinal section of the worm-screw.

Referring to the drawings by letters of reference, A is the primary jaw of the wrench and is provided with the rack-bar B, having the Iteeth C and the handle D. On the bar B slides the secondary jaw E, lwhich has a gap F, in the front and rear side of which are grooves G for the journals H of the wormscrew K to revolve and be raised up and down in.

I I are coil-springs inserted upwardly into the sockets J, below which they project and press constantly upon the journals H to keep the worm-screw normally engaged with the teeth C of the wrench-bar.

I represents side notches'opening from outside into thegrooves G. Through these notches the journals H are inserted sidewise into the grooves G, pressed upward against the resistance of the springs I, and then the wrenchbar B is inserted into the jaw E and receives the worm-screw into its teeth C. The bar B as long as it remains inserted prevents the worm-screw from getting low enough to slip its journals out at the notches L.

As the journals butt against the bottoms of the grooves G, I- save any and all other means for keepingthe journals from longitudinal movement when the journals are made of a plain pin pushed loosely through or into the worm-screw, as indicated in Fig. 3, which is a very cheap way of manufacturing, as round steel or iron needs simply to be cut off and `pushed into the hole run through the wormscrew instead of reducing the ends of the screw to journals. In the best grade of wrenches, however, the journals are made integral with or secured to the worm, and thus need the notches L for their insertion, while in a cheap grade the pin may be loose and inserted in the worm through the sameaperture the bar B is afterward inserted into in the sliding jaw.

The spring-sockets .I may either be cored out in the sliding jaw or, if the jaw instead of being cast from steel be drop-forged, the sockets and the grooves G may be produced by a drill inserted as at M M in Fig. l.

What I claim, and desire to secure by Letters Patent, is

1. A wrench having in combination, a main jaw with a rack-bar and handle thereon, a sliding jaw movable on the rack-bar and carrying a worm-screw which is spring-pressed normally into engagement with the teeth of the rack-bar, but adapted to be raised out of such engagement against the resistance of the springs, said Worm-screw having journals at its ends receiving the pressure of the springs, said sliding jaw having the grooves G adjacent the ends of the springs, for the journals to move in, and the notches L for the journals to pass sidewise in and out of when the sliding jaw is removed from the bar, substantially as set forth.

2. As an improved article of manufacture, a wrench having in combination, the primary jaw A with the rack-bar and handle thereon, as shown, the slidable jaw E, mounted on the bar and having the gap F with the opposite ter is inserted, from reaching said notches L, grooves Gr and adjacent spring-sockets and substantially as and for the purpose set forth. Io springs contained therein and extending into In testimony whereof I affix my signature the grooves, the notches L, and the Worrnin presence of two Witnesses.

5 screw K having journals at its ends adapted Y PETER GRELSON.

to be slipped sidewise through the notches L Witnesses: before the bar is inserted in the sliding jaw, F. L. I-IUMISTON,

and to be prevented by the bar, after the lat- W. B. HIBBARD. 

